diff --git a/.gitignore b/.gitignore
index 51266c8..6627466 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,8 @@
 .parcel-cache/
 ec*.exe
+
+# public (build)
+public/content/
+public/index.*
+public/manifest.webmanifest
+public/*.png
diff --git a/app/partitial/footer.html b/app/partitial/footer.html
index e9d0fb2..414043b 100644
--- a/app/partitial/footer.html
+++ b/app/partitial/footer.html
@@ -1,11 +1,11 @@
 <footer class="text-center text-shadow mt-3 text-white-50">
 	<p class="font-monospace">
-		build:
+		commit:
 		<a
 			class="text-reset text-decoration-none border-bottom py-1"
-			href="#"
+			href="https://git.a2s.su/iiiypuk/a2s.su"
 			target="_blank"
-			>ab6324f</a
+			>{GIT_COMMIT_HASH}</a
 		>
 	</p>
 </footer>
diff --git a/clean_public.sh b/clean_public.sh
new file mode 100755
index 0000000..e33de63
--- /dev/null
+++ b/clean_public.sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+files=(
+    "manifest.webmanifest"
+    "index.html"
+    "*.css*"
+    "*.png"
+)
+
+echo -n "Remove all build files in 'public'... "
+
+for file in "${files[@]}"
+do
+   rm ./public/$file &> /dev/null
+done
+
+echo "Complete!"
diff --git a/package.json b/package.json
index be8d172..885c139 100644
--- a/package.json
+++ b/package.json
@@ -7,6 +7,8 @@
     "serve": "npx parcel serve --dist-dir public app/index.html",
     "build": "npx parcel build --dist-dir public app/index.html --no-optimize",
     "prettier": "npx prettier --write .",
+    "git-hash": "./update_commit.sh",
+    "clean": "./clean_public.sh",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "author": "Alexander Popov <iiiypuk@fastmail.fm>",
diff --git a/public/.gitignore b/public/.gitignore
deleted file mode 100644
index a82bd78..0000000
--- a/public/.gitignore
+++ /dev/null
@@ -1,3 +0,0 @@
-index.*
-manifest.webmanifest
-*.png
diff --git a/update_commit.sh b/update_commit.sh
new file mode 100755
index 0000000..d178855
--- /dev/null
+++ b/update_commit.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+if [ -f "./public/index.html" ]; then
+    GIT_COMMIT_HASH=$(git rev-parse --short HEAD)
+
+    echo -n "Update git commit hash in 'index.html' "
+    sed -i -- "s/{GIT_COMMIT_HASH}/$GIT_COMMIT_HASH/g" ./public/index.html
+    echo " Complete!"
+else
+    echo "Run 'npm run build'"
+fi
+